Unaired OVA bundled with the 20th volume of the Prison School manga, adapting the "Mad Wax" arc.
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Reach thousands of daily viewers · size 1200 x 200
Episode 1
Reach thousands of daily viewers · size 970 x 90
2018 · ★ 8.2
2015 · ★ 6.9
2012 · ★ 6.9
